Motor



Jan 28, 1936- G. B. wlLsoN Er AL MOTOR Filed June 29, 1952 ENT .S

.Sun-Eug 1255.2 Inv.;

ATTORNEYS.

Patented Jan. 28, v.1936

PATENT oFFicE Moron. George B. Wilson and Karl C. Eagley, Erie, Pa. Application June 29, 1932, Serial No. 619,937

4 Claims.

The invention herein is exempliiled as applied to a grease gun pump.

, With pumps used in this relation it is desirable to have the pump automatically continue its pumping action. An example of a pump of this type is one delivering a lubricant into joints. The commonest type of pump accomplishing this purpose has been provided with a. receptacle which fed the lubricant to a pump having a plunger of comparatively small area, driven by a piston of larger area and in the operation of these pumpsl the plunger has been reciprocated in rel sponse tothe manually actuated valve and reset on the release of the valve. So that where more than one plunger charge of lubricant is required itl has been-necessary to manually oper- 'ate the control valve a suiilcient number of times to deliver the desired amount oi' lubricant. With the present `invention a motor is provided which .12,0 will automatically continue its reciprocation so long as the manually operated control valve is maintained in open position. The invention contemplates a convenient and simple mechanism i'or controlling a motor along this line and is particularly useful with a lubricating pump. and is.

so illustrated and exemplified. Features and details oi the invention will appear from the specication and claims.

A preferred embodiment of the invention is B0 illustrated in the accompanying drawing as iollows:-

Fig. 1 shows a central section through the pump and receptacle.

. 3a introducing air to exert pressure on a plunger 4 placing the lubricant in the receptacle under pressure. 45 l A discharge passage 5 `leads from the receptacle and is formed in a fitting '2a in which the'cover 2 is mounted. This discharge passage leads to a passage 6 in a fitting 1 and the passage' leads to a. strainer 8 and a passage, or port 9 leads to a 50 pump cylinder I0. The pump cylinder has a pump plunger A check valve I2 operates ir the cylinder in the ordinary manner and is urgei. to its seat by a spring I3. A connecting end I4 is provided to which the hose, or pipe, leading to 56 the pointof use may be secured.- A relief passage I5 is provided, this being controlled by a valve |6 through which the `back pressure on the discharge connection may be relieved.

A piston I1 operates the plunger II. It is very materially larger, or stepped up in size and oper- 5 ates in a cylinder I8 which in effect is a step extension of the cylinder I-Il. The cylinder I8 isarranged in the tting 2a and thetting 'l is secured to this cylinder by screws I9. A spring 20 operates on th`e piston I1 and gives to the piston 10 its return stroke.

An inlet passage 2| leads to the cylinder I8. This passage is arranged in a nipple 22 which is screwed into an inlet extension 23 on the cylinder I8. A valve cylinder 24 is secured on the nipple 15 '22. A nipple 25 is secured in the opposite end of the valve cylinder and a manually actuated control valve 26 is secured on the nippel 25. A nipple 2l is secured in the valve 26 and an air supply tting 28 is secured on' the nipple 21. A supply 20 valve 29 is secured in the fitting 28 and a supply pipe 30 leads to the valve 29. A passage 3| is arranged in an arm 32 extending laterally from the tting 28. The end of the arm is secured on the cover 3 by a screw 33. This screw has an an- 25 nular passage 34 communicating with the pas- `sage 3| and radial passages 35 connect the annular passage 34 with the inlet passage 3a. It will be seen, therefore, that when air is put on the device through the valve 29 air is immediately 30 delivered to the receptacle so as to exert pressure on the lubricant therein and air is immediately made available at the manually actuated `control valve. The manually controlled valve has a stem 36 terminating in a valve head 31, 35 the valve head operating on a seat 38. The valve 26 has an air passage 39 leading through it which passage is controlled by the valve head. The nipple 25 has a passage 4U which terminates in a restricted inlet passage 4| having a valve seat 40 42 on its inner end. l

The valve cylinder 24 is a stepped cylinder having a larger diameter 24a and a smaller diameter 24h. A valve plunger 43 has a larger end- 44 operating in the cylinder end 24a. and a'small- 45 er end 45 operating in the cylinder end 24h.' The valve plunger has a passage 46 extending partially through it v'and this is extended through the valve plunger by a restricted passage`4'l. A ilexible cup 48 is secured on the plunger by a nut 50 49. The cylinder has an exhaust passage 50 which is opened as the plunger reaches its ex treme position to the left. The cylinder also has passages 5| which relieve the pressure at the stepped end of the valve plunger. The end of u' the plunger is conical and forms a valve head 43a operating on the seat 42 so that with pressureon the plunger 43- the inlet passage 4I is In the operation of the device when the manup ally actuated control valve is open, air isl del livered against the valve head'43a. While the areal of thisdssver'gsmall the valve plunger has no pressure resistance to movement. The valve I here is immediately penpal and air moves throughthe restricted opemng--41 and passages 46, 2l, to the cylinder I8 operatingon the piston I1 and forcing the pump plunger forward. The `valve plunger when itstarts to move imme 'ately moves to the extreme lend of its position be;

pressure immediately builds up in the cylinder I8 and also at Jthe enlarged end vof the plunger '43 so that it soon`balances the pressurel at the smaller end of the plunger 43. Immediately this happens the diiferential pressure on this plunger,

- due to the differences in exposed areas, results in a quick-movementof the valve plunger to the left, closing the inlet passage 42 and opening the exhaust; The piston I1 then immediately `begins itsq'eturn. movement under the inuience of the 20,' forcing the air from the cyl- )luder and connected parts out through the exhaust. As soon as the piston reaches .the rear-v `end ogits stroke, the' pressure exerted on the plunger 43 isredueed'andl as soon as it o reaches a point low enough to' permit the air f exhaust working on the end,4 of the head 43a,to.open the valve, the valve plunger 43 is again moved radi-k ally back to the position to the right closing the ,openingtheairtothe piston I1 so asto- 45. repeat the operation. In this manner the pis-.-l

ton I1 may be made to reciprocate rapidly so -long as the lmanually actuated control valve 36 isA maintained in an open position. 'As soon asu' the manually actuated valve is closed there is a balancing oi.' pressure throughout the parts between the controlling valve'and the piston I1 and as soon as this pressure has balanced the pressure at theltwo ends of the plunger 43 the, diherential pressure on the larger end of the plunger causes 'the vplunger to move to the left inzposition to close the valveliead 43a and to open the exhaust and this-permits the piston I1` to be moved back to the initial position. It' will be under that 'the force of thespring 2li must be suiiic ent to maintainqa pressure in the valve cylinder to close the valve lhearlladuring the exhaustingperiod. .Thiskinvolves a proper pro-- portioningof the exhaust passage 59. It also involves such a proportioning of the passage 41 as to 55 maintain a preponderance of-pressure ,at the left o f the plunger 43 during the forward movement ofV the piston as it is this preponderance v that'` maintains .the automatic valvein its openpsition and the exhaustlclosed. -It is' desir- 70 able to make the passage n' and the mier .passage 42 vas large as-possible so `as to. get a more rapid actionjandt the same time maintain the opera-I tive relations just' described. vThis relation may -be more readily achieved by providing a` small ,u 'auxiliary bpening- 52 connecting the passage 41H direct 'withthe inlet'passage 42 which will deliver a small amount of air to the valve cylinder during the exhausting pensa mid w1'11 thus add slightly to the pressure in that cylinder over an`d above the pressure which the return of the piston I1 produces, it being understood that the friction and suction effort of the plunger II in the cylinder I0 may retard this movement slightly. Thus with this smallfcommunicating passage .52 these relations may be more definitely assured.

The structure of the plunger shown in Fig. 4 is similar to that shown in Fig. 2 except that the cup 24h is omitted and the plunger t is depended on for frming'a closure with the cylinder walls.

What is claimedgas new is:-

l. A motor comprising a body; a piston operating in the body; a pressure iiuid supply means delivering uid to the body in pressure relation 'to the piston; and a valve mechanism in said supply means comprising a valve chambera reciprocating valve seating inthe chamber and con- `trolling an alternate iiuid supply and exhaust to and from the body, said valve having opposed diierential surfaces subjected to the supply fluid with the surface of lesser area subjected to ingoing iiuid and Vthe surface of greater area to the outgoing fluid, said chamber having anfinlt 'for the ingoing uid, an o'utlet leading to the body and an exhaust port discharging the iiuid from the outlet side=of.the valve, saidexhaust being closed during the building up of pressure in the body vand valve chamber, the valve being immediately responsive in alternative movement t0- pressure diiferences on the opposite ends of the valve induced by iiuid pressure. differences.

. 2. A motor comprising a body; a piston operating in the body; a pressure fluid supply means delivering fluid to the body in pressure relation for the ingoing fluid, an outlet leading to the .to the piston; and a valve mechanism in. said body and an exhaust port discharging the fluid from the outlet sideV of the valve, said exhaust 50 being closed duringr the building up ofpressure in the body and valve chamber, the valve being immediately responsive in alternate movement toy `pressure diierences on the opposite ends of the valve induced by uid pressure differences, said V5g;

pressure ditfernces in they body beingv induced at onejend ofl the power stroke by the stoppage of the piston. I 3. A motor comprising a body; a piston operating in thehody;.a pressure iiuid supply means delivering fluidto the body in pressure relation L v to ythe piston; and a valve mechanism in said supply means comprising a valve chamber, areciprocating valve seating in the chamber and controlling-an alternate'uid supply and exhaust to and from the body, said valve having opposed differential surfaces subjected to the supply fluid with the surface of lesser area subjected to in- .l I

going fiuid and the surfae ofgreater area to theoutgoing'iiuid saidchamber an inlet for the ingoing fluid, anoutlet leading to th bo and an exhaust port discharging the fiui from the outlet side of the valve, said exhaust being: closed during thepuilding up of pressure in-the body; valvevchamber, thevalve. being imme- .75

dlately resp nsive in alternate movement to pressure diierenc s on the opposite ends of the valve induced by uid pressure differences, said pressure dierences in the body being induced at one end of the power stroke by the stoppage of the piston and at the return stroke of the piston by the exhaust.

4. A motor comprisingv a body; a piston operatlng in the body; a pressure uid supply means 10 leading to the body; an automatic valve mechanism in the supply means comprising a step cylinder; a restricted inlet to the cylinder; a valve seat at the inlet; an exhaust passage; a step valve plunger in the cylinder having a head operating on the seat, said plunger moving over the exhaust passage to open the same as the inlet is closed, the small end of the plunger being at the inlet end of the plunger; and a restricted port through the plunger.

GEORGE B. WILSON.

KARL C. -EAGLEY. 

